Influence of the microstructure on stress-dependent P-wave anisotropy in sandstone
文献类型：期刊论文
| 作者 | Shen, Haimeng1,2; Li, Xiaying1,2; Li, Qi1,2
|
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 228期号:2页码:876-892 |
| 关键词 | Microstructure Geomechanics Numerical modelling Acoustic properties Wave propagation |
| ISSN号 | 0956-540X |
| DOI | 10.1093/gji/ggab383 |
| 英文摘要 | To understand the factors that affect the stress-dependent P-wave velocity anisotropy, a method is proposed to simulate anisotropic microcracks and minerals based on the discrete element method (DEM). Laboratory triaxial tests and numerical simulations were performed on sandstone samples with bedding orientations parallel and perpendicular to the maximum principal stress. The ellipse fitting method was applied to analyse the variation in P-wave anisotropy. The micromechanism of stress-dependent P-wave anisotropy was revealed. The evolution of microcracks is the main reason for the change in P-wave anisotropy under compression. As the confining pressure increases, the magnitude of the P-wave anisotropy is reduced. The weakening of the P-wave anisotropy results from the decrease in the number of open microcracks. Under deviatoric stress loading, the P-wave anisotropy of the bedding-parallel sample in the axial direction is strengthened. Anisotropy reversal occurs in the bedding-normal sample. The microcrack behaviour depends on the direction of maximum principal stress. The variation in microcrack anisotropy induced by stress controls the evolution of P-wave velocity anisotropy. The stress at which anisotropic reversal occurs depends on the preferred orientation mineral. The DEM model offers the unique ability to directly examine the variation in microstructure anisotropy that causes the change in P-wave anisotropy. |
| 资助项目 | National Natural Science Foundation of China[41902297] ; National Natural Science Foundation of China[41872210] ; Natural Science Foundation of Hubei Province[2018CFB292] ; Open Research Fund of the State Key Laboratory of Geomechanics and Geotechnical Engineering[Z017006] ; China Scholarship Council[202004910626] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000741354200011 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/30774]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Li, Qi |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shen, Haimeng,Li, Xiaying,Li, Qi. Influence of the microstructure on stress-dependent P-wave anisotropy in sandstone[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2022,228(2):876-892. |
| APA | Shen, Haimeng,Li, Xiaying,&Li, Qi.(2022).Influence of the microstructure on stress-dependent P-wave anisotropy in sandstone.GEOPHYSICAL JOURNAL INTERNATIONAL,228(2),876-892. |
| MLA | Shen, Haimeng,et al."Influence of the microstructure on stress-dependent P-wave anisotropy in sandstone".GEOPHYSICAL JOURNAL INTERNATIONAL 228.2(2022):876-892. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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